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An analysis of the retrofitting potential of a subcritical ORC into a partial evaporating ORC under off-design operation

Steven Lecompte (UGent) and Michel De Paepe (UGent)
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Abstract
Many applications where ORCs are installed have time varying waste heat streams. To account for this, flexible and robust off-design models are necessary. In addition, alternative operating conditions and cycle architectures show potential for increased performance. This work investigates how operation as a partial evaporating cycle (PEORC) affects the performance of the ORC. More specifically, the question is raised if current subcritical ORC (SCORC) installations provide potential to be retrofitted into PEORC operation by analysing their off-design operation. The initial results show that under these conditions the PEORC shows a potential net power output increase between 2% to 12% relative to the base SCORC depending on the off-design conditions. The optimal expander inlet vapour fraction that maximises the net power output ranges between 0.5 and 1. With roughly the same maximum pressures, the same working fluid, and an adapted measuring and control strategy, significant net power improvements could thus be achieved. It is important to note that for PEORC operation the performance of the pump becomes determinative. Installing a pump with a better efficiency would further benefit operation as PEORC. Based on these results, there are clearly opportunities in retrofitting existing SCORC systems.
Keywords
Organic Rankine cycle, Triangular cycle, Thermodynamics, Wet-expansion

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MLA
Lecompte, Steven, and Michel De Paepe. “An Analysis of the Retrofitting Potential of a Subcritical ORC into a Partial Evaporating ORC under Off-Design Operation.” Proceedings of ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, 2018.
APA
Lecompte, S., & De Paepe, M. (2018). An analysis of the retrofitting potential of a subcritical ORC into a partial evaporating ORC under off-design operation. Proceedings of ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. Presented at the ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Guimarães, Portugal.
Chicago author-date
Lecompte, Steven, and Michel De Paepe. 2018. “An Analysis of the Retrofitting Potential of a Subcritical ORC into a Partial Evaporating ORC under Off-Design Operation.” In Proceedings of ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.
Chicago author-date (all authors)
Lecompte, Steven, and Michel De Paepe. 2018. “An Analysis of the Retrofitting Potential of a Subcritical ORC into a Partial Evaporating ORC under Off-Design Operation.” In Proceedings of ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.
Vancouver
1.
Lecompte S, De Paepe M. An analysis of the retrofitting potential of a subcritical ORC into a partial evaporating ORC under off-design operation. In: Proceedings of ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. 2018.
IEEE
[1]
S. Lecompte and M. De Paepe, “An analysis of the retrofitting potential of a subcritical ORC into a partial evaporating ORC under off-design operation,” in Proceedings of ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Guimarães, Portugal, 2018.
@inproceedings{8570042,
  abstract     = {{Many applications where ORCs are installed have time varying waste heat streams. To account for this, flexible and robust off-design models are necessary. In addition, alternative operating conditions and cycle architectures show potential for increased performance. This work investigates how operation as a partial evaporating cycle (PEORC) affects the performance of the ORC. More specifically, the question is raised if current subcritical ORC (SCORC) installations provide potential to be retrofitted into PEORC operation by analysing their off-design operation. The initial results show that under these conditions the PEORC shows a potential net power output increase between 2% to 12% relative to the base SCORC depending on the off-design conditions. The optimal expander inlet vapour fraction that maximises the net power output ranges between 0.5 and 1. With roughly the same maximum pressures, the same working fluid, and an adapted measuring and control strategy, significant net power improvements could thus be achieved. It is important to note that for PEORC operation the performance of the pump becomes determinative. Installing a pump with a better efficiency would further benefit operation as PEORC. Based on these results, there are clearly opportunities in retrofitting existing SCORC systems.}},
  author       = {{Lecompte, Steven and De Paepe, Michel}},
  booktitle    = {{Proceedings of ECOS 2018 - The 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems}},
  keywords     = {{Organic Rankine cycle,Triangular cycle,Thermodynamics,Wet-expansion}},
  language     = {{eng}},
  location     = {{Guimarães, Portugal}},
  title        = {{An analysis of the retrofitting potential of a subcritical ORC into a partial evaporating ORC under off-design operation}},
  year         = {{2018}},
}